School spokeswoman Beth McLaughlin said she was not aware of the additional complaints, but said, "It's our districts intent to comply with prevailing law in these matters."

Monday, Seidel said the Veterans complaint referenced an opening prayer, gospel music and a speech by Superintendent Robins Hines that "morphed into a sermon."

He says courts have ruled school-sponsored prayers are a violation of the First Amendment.

"The graduation prayer in itself is unconstitutional, and the courts have been quite clear on that," he said.

He says they'd prefer to work out the matter with the district. But their options include filing a lawsuit.

His letter asks Hines to "immediately take action to ensure that the graduation ceremonies at all Houston County schools do not inculde prayer or religious musical performances in the future."

Seidel also criticized the performance of "Find Your Wings," orginally recorded by gospel singer Mark Harris.

The song's explicitly Christian message, he writes, "excludes not only non-evangelical Christians, but Jewish, Muslim and non-religious students and their families."

"Public schools should not be seeking out songs that exclude students and create a divisive atmosphere. Bullying is rampant in schools and on social media, and Houston County schools should be striving (to) find inclusive, secular songs that all can enjoy without compromising their own personal beliefs."

And he concludes by telling Hines, "That you would not know or honor the Constitution of the United States is shocking."